I have a set of CNC ported 6.1L heads that came off a car I parted out about 4 years ago. I had then cleaned up and inspected by my machine shop. They did a valve job and installed new valve seals.
While the heads were off, I removed the lifters and installed an Arrington SR2B camshaft. With a good tune, the CNC ported heads and cam should be good for close to 500hp

1970 Barracuda B5 6.1 Hemi/6 speed
1969 Charger survivor in R6 383/727-wrecked 12/24/18
1968 Charger in original burgundy paint "Ribeye"
1968 Charger w/ 6.1L, TR-6060, 9"
1968 Charger...clean slate in epoxy
1968 Roadrunner w/ 6.1L/6 speed
2010 B5 Challenger SRT 6.1L/6 speed
2011 Dodge Ram w/ 6.7L